Cook County has identified its third measles case of the year in a 4-year-old child who lives in the Chicago suburbs.

The Cook County Department of Public Health said officials believe the case was linked to international travel. The agency is working to notify people who may have been exposed. Terminal 5 at O’Hare International Airport was a point of public exposure on Thursday from 7:30 a.m. to 11 a.m., officials said.

A Chicago resident and a suburban resident were both confirmed to have measles, a respiratory disease caused by one of the world’s most contagious viruses, in April, and Illinois officials declared the state’s measles outbreak over in July when eight cases had been reported. As of last week, nearly 1,500 measles cases have been reported and three people have died this ye

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